Prefered 300B tubes for Canary Amplifiers

The price of new production 300B tubes has really escaladed over the last couple of years. I remember when a top China 300B could be has for $200/pair. European 300B, EAT, AVVT, EML, KR Audio have always been around the $700/pr mark. China and now Japan has seen a great appetite for premium 300B tubes and have marketed these tubes primarily to the US marketplace.

I am not going to comment on the value proposition of these new production tubes because price performance is purely subjective. I have listened to Takatsuki and they are indeed a superb tube, but at a price of $2,000/pr, they now make some of the European 300B look like a bargain.

On the plus side, 300B’s last a very longtime; therefore, the sting of price can be offset with the number of years of enjoyment you will get.

Also, from what I have read, 300B in PP configuration run the tubes harder when compared to single ended, therefore, an XLS tube may be better suited for your application. Take a look at the Canary specs to see exactly how the tubes are stressed. Take your time, and see what other Canary owners are using.

I know that before Coincident started marketing their own amplifiers, Coincident used Canary amps with KR 300B.

Brf,
One great feature of 300b and low power DHT tubes in general is their longevity, much better and also more reliable than my prior KT 88 and 6550 tubed amps(won't go back to that).Unless you have an amp that really pushes the tube, most should get many enjoyable years from their 300b.What is the operating point and watt dissipation of the Carnary circuit. Maximum dissipation for the 300b per WE standard is 40 watts.It would seem a push pull circuit should be easier on the tube since the driving is shared among the tubes (one pushes and the other pulls)as opposed to the SET where the tube responsible for the full cycle.I certainly could be wrong.
Regrds,

One reason amp manufacture utilize 300B's in PP configuration is to achieve more power. Since power is the objective, most 300B PP designs run the 300B at their maximum limit. That’s the general consensus, but as always, exceptions to the rule exist.

Can anyone estimate the longevity of a 300b in a "typical" SET?

Based on the WE300B spec sheet, they should last for 40,000 hours. Remember, the 300B tube was developed to amplify telephone signals back in the late 30's.